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anion gap The Anion Gap is an approximate measurement of ions, that is molecules with a charge, either negative or positive. Sodium and potassium are positively charged and therefore called cations; this is why they are often represented as Na + and K + respectively.
Get help from a doctor now âº. Anion gap: The anion gap is a calculation in which you subtract the sum of the negative ions in the blood (chloride, bicarbonate) from the sum of the positive ions (sodium, potassium).Often potassium is left out because it has only a very small effect.et help from a doctor now âº. Anion gap: The anion gap is a calculation in which you subtract the sum of the negative ions in the blood (chloride, bicarbonate) from the sum of the positive ions (sodium, potassium).